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Re: [Openexr-devel] magic numbers

From: Florian Kainz
Subject: Re: [Openexr-devel] magic numbers
Date: Wed, 17 Jan 2007 13:39:22 -0800
User-agent: Mozilla Thunderbird 1.0 (X11/20041207) 
I think you are getting into numerology...

We simply decided that a properly exposed 18% gray reflector
(the standard target for light meters) should map to roughly
0.18 in the image file, so that an ideal white reflector under
the same lighting conditions maps to 1.0.  Black = 0, white = 1
is easy to remember.
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